我在以下代码中使用org.asynchttpclient.async-http-client version 2.2.0：
public class Application
{
public static void main(String[] args) throws InterruptedException, ExecutionException, IOException
{
AsyncHttpClient httpClient = null;
AsyncHttpClientConfig config =
Dsl.config()
.setConnectTimeout(1000)
.setRequestTimeout(5000)
.setKeepAlive(true)
.build();
try {
httpClient = Dsl.asyncHttpClient(config);
String url ="https://www.google.com";
Response r = httpClient.prepareGet(url).execute().get();
String result = r.getResponseBody(Charset.forName("UTF-8"));
System.out.println(result.toString());
} finally {
ClientStats stats = httpClient.getClientStats();
System.out.println(stats);
httpClient.close();
stats = httpClient.getClientStats();
System.out.println(stats);
}
}
}
该程序运行良好，可以检索Google HTML，但不会退出。它会无限期挂起，直到有人将其杀死。似乎以某种方式httpClient.close();并没有释放所有资源，因此虚拟机保持活动状态。
这是执行日志：
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/home/u096285/.m2/repository/org/slf4j/slf4j-api/1.7.25/slf4j-api-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/home/u096285/.m2/repository/ch/qos/logback/logback-classic/1.1.11/logback-classic-1.1.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
19:27:42.837 [main] DEBUG io.netty.util.internal.logging.InternalLoggerFactory - Using SLF4J as the default logging framework
19:27:42.849 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.level: simple
19:27:42.851 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.targetRecords: 4
19:27:42.921 [main] DEBUG io.netty.util.internal.PlatformDependent - Platform: Windows
19:27:42.924 [main] DEBUG io.netty.util.internal.PlatformDependent0 - -Dio.netty.noUnsafe: false
19:27:42.925 [main] DEBUG io.netty.util.internal.PlatformDependent0 - Java version: 8
19:27:42.927 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.theUnsafe: available
19:27:42.928 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.copyMemory: available
19:27:42.929 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Buffer.address: available
19:27:42.930 [main] DEBUG io.netty.util.internal.PlatformDependent0 - direct buffer constructor: available
19:27:42.932 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Bits.unaligned: available, true
19:27:42.932 [main] DEBUG io.netty.util.internal.PlatformDependent0 - jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable prior to Java9
19:27:42.932 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.DirectByteBuffer.<init>(long, int): available
19:27:42.932 [main] DEBUG io.netty.util.internal.PlatformDependent - sun.misc.Unsafe: available
19:27:42.933 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.tmpdir: C:\Users\u096285\AppData\Local\Temp (java.io.tmpdir)
19:27:42.933 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.bitMode: 64 (sun.arch.data.model)
19:27:42.935 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.noPreferDirect: false
19:27:42.936 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.maxDirectMemory: 1879048192 bytes
19:27:42.936 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.uninitializedArrayAllocationThreshold: -1
19:27:42.937 [main] DEBUG io.netty.util.internal.CleanerJava6 - java.nio.ByteBuffer.cleaner(): available
19:27:42.938 [main] DEBUG io.netty.util.ResourceLeakDetectorFactory - Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@71c7db30
19:27:42.962 [main] DEBUG io.netty.util.internal.PlatformDependent - org.jctools-core.MpscChunkedArrayQueue: available
19:27:43.721 [main] DEBUG io.netty.handler.ssl.JdkSslContext - Default protocols (JDK): [TLSv1.2, TLSv1.1, TLSv1]
19:27:43.721 [main] DEBUG io.netty.handler.ssl.JdkSslContext - Default cipher suites (JDK): [TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_128_CBC_SHA]
19:27:43.781 [main] DEBUG io.netty.channel.MultithreadEventLoopGroup - -Dio.netty.eventLoopThreads: 8
19:27:43.791 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.noKeySetOptimization: false
19:27:43.791 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.selectorAutoRebuildThreshold: 512
19:27:43.837 [main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.initialSize: 1024
19:27:43.837 [main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.maxSize: 4096
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numHeapArenas: 8
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numDirectArenas: 8
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.pageSize: 8192
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxOrder: 11
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.chunkSize: 16777216
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.tinyCacheSize: 512
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.smallCacheSize: 256
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.normalCacheSize: 64
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxCachedBufferCapacity: 32768
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.cacheTrimInterval: 8192
19:27:43.847 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.useCacheForAllThreads: true
19:27:43.855 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.allocator.type: pooled
19:27:43.855 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.threadLocalDirectBufferSize: 65536
19:27:43.855 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.maxThreadLocalCharBufferSize: 16384
19:27:44.015 [main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.processId: 13112 (auto-detected)
19:27:44.017 [main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv4Stack: false
19:27:44.017 [main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv6Addresses: false
19:27:44.213 [main] DEBUG io.netty.util.NetUtil - Loopback interface: lo (Software Loopback Interface 1, 127.0.0.1)
19:27:44.214 [main] DEBUG io.netty.util.NetUtil - Failed to get SOMAXCONN from sysctl and file \proc\sys\net\core\somaxconn. Default: 200
19:27:44.426 [main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.machineId: e8:2a:ea:ff:fe:2c:cf:9a (auto-detected)
19:27:44.475 [AsyncHttpClient-2-1] DEBUG io.netty.buffer.AbstractByteBuf - -Dio.netty.buffer.bytebuf.checkAccessible: true
19:27:44.475 [AsyncHttpClient-2-1] DEBUG io.netty.util.ResourceLeakDetectorFactory - Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@58ef4cc
19:27:44.533 [AsyncHttpClient-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxCapacityPerThread: 32768
19:27:44.533 [AsyncHttpClient-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxSharedCapacityFactor: 2
19:27:44.533 [AsyncHttpClient-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.linkCapacity: 16
19:27:44.533 [AsyncHttpClient-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.ratio: 8
19:27:44.620 [AsyncHttpClient-2-1] DEBUG org.asynchttpclient.netty.channel.NettyConnectListener - Using new Channel '[id: 0x04f0b68b, L:/10.23.78.87:65044 - R:www.google.com/172.217.17.4:443]' for 'GET' to '/'
19:27:44.640 [AsyncHttpClient-2-1] DEBUG io.netty.handler.ssl.SslHandler - [id: 0x04f0b68b, L:/10.23.78.87:65044 - R:www.google.com/172.217.17.4:443] HANDSHAKEN: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
19:27:44.700 [AsyncHttpClient-2-1] DEBUG org.asynchttpclient.netty.handler.HttpHandler -
Request DefaultFullHttpRequest(decodeResult: success, version: HTTP/1.1, content: EmptyByteBufBE)
GET / HTTP/1.1
host: www.google.com
accept: */*
user-agent: AHC/2.1
Response DefaultHttpResponse(decodeResult: success, version: HTTP/1.1)
HTTP/1.1 200 OK
Date: Wed, 19 Jun 2019 17:27:44 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
P3P: CP="This is not a P3P policy! See g.co/p3phelp for more info."
Server: gws
X-XSS-Protection: 0
X-Frame-Options: SAMEORIGIN
Set-Cookie: 1P_JAR=2019-06-19-17; expires=Fri, 19-Jul-2019 17:27:44 GMT; path=/; domain=.google.com
Set-Cookie: NID=186=f79HtEZwEwn8ivi3Y0dp6reZ6S6cA6wILrGF9RfPB1yxf5M8LDWVS4ahdsmHzVh3nAAmjXTPJSrMeQCNSlR7xYirMDJJ8Dz2PIBSrCPdjwF1UIRwK1VyfKTqQZO5ke-HyldO4-BIvU1QFJ5ZdzdruCti4TeqQVgCpXexuJ9mAwI; expires=Thu, 19-Dec-2019 17:27:44 GMT; path=/; domain=.google.com; HttpOnly
Alt-Svc: quic=":443"; ma=2592000; v="46,44,43,39"
Accept-Ranges: none
Vary: Accept-Encoding
Transfer-Encoding: chunked
19:27:44.729 [AsyncHttpClient-2-1] DEBUG org.asynchttpclient.netty.channel.ChannelManager - Adding key: https://www.google.com:443 for channel [id: 0x04f0b68b, L:/10.23.78.87:65044 - R:www.google.com/172.217.17.4:443]
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There are 1 total connections, 0 are active and 1 are idle.
There are 0 total connections, 0 are active and 0 are idle.
19:27:46.869 [AsyncHttpClient-2-1] DEBUG io.netty.buffer.PoolThreadCache - Freed 14 thread-local buffer(s) from thread: AsyncHttpClient-2-1
这是最简单的代码版本。我显然是从它的异步版本开始的，结果相同。
如您所见，关闭httpclient后，统计信息显示没有连接，无论是活动还是空闲。
我在做什么错了？